Ack! Help!

I got my audition excerpts in the mail yesterday for Northwestern. George Washington Bridge by Schuman (Wind Ensemble) and Symphony No. 5 by Tchaikovsky (orchestra). Any tips? What I really need to know is how to transpose from the A trumpet part on the Tchaikovsky to my Bb. Is it just the opposite as transposing from C? Do I just add two flats and take each note down? Help please!

Man, seven days to learn these, continue relearning Hummel, and working on the scale list they sent me. Looks like I have my work cut out for me. Oh well. I love every minute of it.

Your very nervous, stressed, yet somehow having the time of his life in looking forward to NW friend,

Wow... 5 years of stuggling with transposition and suddenly it's that easy... On one of my orchesteral pieces I even went to the distance of copying it all on my Finale program and letting the computer do it. I really wish I would have learned this sooner. Thanks!